Peng W.,The Second Research Institute of General Administration of Civil Aviation of China |
Peng W.,Sichuan Agricultural University |
Huang R.,The Second Research Institute of General Administration of Civil Aviation of China |
Guo J.,The Second Research Institute of General Administration of Civil Aviation of China |
And 2 more authors.
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica
Instead of regular three-dimensional targets, the height of targets at airport surface is a known constant and it should be considered when designing an multilateration (MLAT) system suitable for surveillance at civil airport surface. Based on the characteristics of target at airport surface and MLAT, we propose a modified time of difference arrival (TDOA) positioning algorithm, which is especially useful for MLAT system for the airport surface surveillance. Compared with traditional three-dimensional positioning way, the proposed algorithm not only improves the positioning accuracy but also gets greater system robustness. A corresponding Cramer-Rao lower bound (CRLB) of this algorithm is achieved, and the theoretical relation between two-dimensional and three-dimensional positioning algorithms is deduced, which further proves that the algorithm has higher precision than three-dimensional way. Meanwhile we use condition number theory to prove that the proposed algorithm has stronger robustness than three-dimensional positioning way. The simulation and practical measured data verify the correctness and effectiveness of the above conclusions. ©, 2015, AAAS Press of Chinese Society of Aeronautics and Astronautics. All right reserved. Source